Blog and default element isn't changing

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Hopefully, this is an easy fix. I just created a blog with my website: www.victoriahaysales.com with my first post. I noticed that when I click on the post to read it in full, that to the right is the default element (horses and riders) along with the default text below it. It doesn't appear on the main page of the blog but only after I click on the blog post. I cannot get that image and text box to disappear. Suggestions?